GB2208676B - Roof supports - Google Patents

Roof supports

Info

Publication number
GB2208676B
GB2208676B GB8818507A GB8818507A GB2208676B GB 2208676 B GB2208676 B GB 2208676B GB 8818507 A GB8818507 A GB 8818507A GB 8818507 A GB8818507 A GB 8818507A GB 2208676 B GB2208676 B GB 2208676B
Authority
GB
United Kingdom
Prior art keywords
roof supports
roof
supports
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB8818507A
Other versions
GB8818507D0 (en
GB2208676A (en
Inventor
John Hirst Walker
Peter Crossland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dowty Mining Equipment Ltd
Meco Mining Equipment Ltd
Original Assignee
Dowty Mining Equipment Ltd
Meco Mining Equipment Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dowty Mining Equipment Ltd, Meco Mining Equipment Ltd filed Critical Dowty Mining Equipment Ltd
Publication of GB8818507D0 publication Critical patent/GB8818507D0/en
Publication of GB2208676A publication Critical patent/GB2208676A/en
Application granted granted Critical
Publication of GB2208676B publication Critical patent/GB2208676B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
    • E21D23/066—Pivoted cantilever extensions therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
GB8818507A 1987-08-13 1988-08-04 Roof supports Expired - Fee Related GB2208676B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878719200A GB8719200D0 (en) 1987-08-13 1987-08-13 Roof supports

Publications (3)

Publication Number Publication Date
GB8818507D0 GB8818507D0 (en) 1988-09-07
GB2208676A GB2208676A (en) 1989-04-12
GB2208676B true GB2208676B (en) 1991-12-04

Family

ID=10622266

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878719200A Pending GB8719200D0 (en) 1987-08-13 1987-08-13 Roof supports
GB8818507A Expired - Fee Related GB2208676B (en) 1987-08-13 1988-08-04 Roof supports

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB878719200A Pending GB8719200D0 (en) 1987-08-13 1987-08-13 Roof supports

Country Status (1)

Country Link
GB (2) GB8719200D0 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB983551A (en) * 1960-04-01 1965-02-17 Groetschel Karl Maria An advancing mine roof support

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB983551A (en) * 1960-04-01 1965-02-17 Groetschel Karl Maria An advancing mine roof support

Also Published As

Publication number Publication date
GB8719200D0 (en) 1987-09-23
GB8818507D0 (en) 1988-09-07
GB2208676A (en) 1989-04-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970804